fast ruby
1.0.0
Dalam ceramah hebat Erik Michaels-Ower, 'Writing Fast Ruby': Video @ Baruco 2014, Slide, ia memberi kami banyak idiom yang mengarah pada kode Ruby yang lebih cepat menjalankan. Dia menginspirasi saya untuk mendokumentasikan ini agar lebih banyak orang tahu. Saya mencoba menautkan ke komitmen nyata sehingga orang dapat melihat bahwa ini benar -benar dapat memiliki manfaat di dunia nyata. Ini tidak berarti Anda selalu dapat secara membabi buta mengganti satu dengan yang lain. Itu tergantung pada konteksnya (misalnya gsub versus tr ). Pengingat yang Ramah: Gunakan dengan hati -hati!
Setiap idiom memiliki contoh kode yang sesuai yang berada dalam kode.
Semua hasil yang tercantum dalam readme.md berjalan dengan Ruby 2.2.0p0 pada OS X 10.10.1. Informasi Mesin: MacBook Pro (retina, 15-inci, pertengahan 2014), 2,5 GHz Intel Core i7, 16 GB 1600 MHz DDR3. Hasil Anda mungkin bervariasi, tetapi Anda mendapatkan idenya. : "
Anda dapat checkout, tindakan GitHub yang dibangun untuk hasil tolok ukur ini berlari melawan implementasi Ruby yang berbeda.
Mari kita tulis kode yang lebih cepat, bersama -sama! <3
Checkout The Fasterer Project - ini adalah analisis statis yang memeriksa idiom kecepatan yang ditulis dalam repo ini.
Gunakan Benchmark-IPS (2.0+).
require "benchmark/ips"
def fast
end
def slow
end
Benchmark . ips do | x |
x . report ( "fast code description" ) { fast }
x . report ( "slow code description" ) { slow }
x . compare!
end attr_accessor vs getter and setter codehttps://www.omniref.com/ruby/2.2.0/files/method.h?#annotation=4081781&line=47
$ ruby -v code/general/attr-accessor-vs-getter-and-setter.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
getter_and_setter 61.240k i/100ms
attr_accessor 66.535k i/100ms
-------------------------------------------------
getter_and_setter 1.660M (± 9.7%) i/s - 8.267M
attr_accessor 1.865M (± 9.2%) i/s - 9.248M
Comparison:
attr_accessor: 1865408.4 i/s
getter_and_setter: 1660021.9 i/s - 1.12x slower
begin...rescue vs respond_to? untuk kode aliran kontrol $ ruby -v code/general/begin-rescue-vs-respond-to.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
begin...rescue 29.452k i/100ms
respond_to? 106.528k i/100ms
-------------------------------------------------
begin...rescue 371.591k (± 5.4%) i/s - 1.855M
respond_to? 3.277M (± 7.5%) i/s - 16.299M
Comparison:
respond_to?: 3276972.3 i/s
begin...rescue: 371591.0 i/s - 8.82x slower
define_method vs module_eval untuk mendefinisikan kode metode $ ruby -v code/general/define_method-vs-module-eval.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
module_eval with string 125.000 i/100ms
define_method 138.000 i/100ms
-------------------------------------------------
module_eval with string 1.130k (±20.3%) i/s - 5.500k
define_method 1.346k (±25.9%) i/s - 6.348k
Comparison:
define_method: 1345.6 i/s
module_eval with string: 1129.7 i/s - 1.19x slower
String#constantize vs Perbandingan untuk Kode InfleksiString ActiveSupport#Konstantisasi "menyelesaikan ekspresi referensi konstan di penerima".
Baca alasannya di sini
ruby 2.7.3p183 (2021-04-05 revision 6847ee089d) [x86_64-darwin20]
Calculating -------------------------------------
using an if statement
8.124M (± 1.8%) i/s - 41.357M in 5.092437s
String#constantize 2.462M (± 2.4%) i/s - 12.315M in 5.004089s
Comparison:
using an if statement: 8123851.3 i/s
String#constantize: 2462371.2 i/s - 3.30x (± 0.00) slower
raise vs E2MM#Raise untuk meningkatkan (dan mendefinisikan) kode pengecualianModul Exception2MessageMapper Ruby memungkinkan seseorang untuk mendefinisikan dan meningkatkan pengecualian dengan pesan yang telah ditentukan.
$ ruby -v code/general/raise-vs-e2mmap.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
Calculating -------------------------------------
Ruby exception: E2MM#Raise
2.865k i/100ms
Ruby exception: Kernel#raise
42.215k i/100ms
-------------------------------------------------
Ruby exception: E2MM#Raise
27.270k (± 8.8%) i/s - 137.520k
Ruby exception: Kernel#raise
617.446k (± 7.9%) i/s - 3.082M
Comparison:
Ruby exception: Kernel#raise: 617446.2 i/s
Ruby exception: E2MM#Raise: 27269.8 i/s - 22.64x slower
Calculating -------------------------------------
Custom exception: E2MM#Raise
2.807k i/100ms
Custom exception: Kernel#raise
45.313k i/100ms
-------------------------------------------------
Custom exception: E2MM#Raise
29.005k (± 7.2%) i/s - 145.964k
Custom exception: Kernel#raise
589.149k (± 7.8%) i/s - 2.945M
Comparison:
Custom exception: Kernel#raise: 589148.7 i/s
Custom exception: E2MM#Raise: 29004.8 i/s - 20.31x slower
loop vs while true code $ ruby -v code/general/loop-vs-while-true.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
Calculating -------------------------------------
While Loop 1.000 i/100ms
Kernel loop 1.000 i/100ms
-------------------------------------------------
While Loop 0.536 (± 0.0%) i/s - 3.000 in 5.593042s
Kernel loop 0.223 (± 0.0%) i/s - 2.000 in 8.982355s
Comparison:
While Loop: 0.5 i/s
Kernel loop: 0.2 i/s - 2.41x slower
ancestors.include? vs <= kode $ ruby -vW0 code/general/inheritance-check.rb
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]
Warming up --------------------------------------
less than or equal 66.992k i/100ms
ancestors.include? 16.943k i/100ms
Calculating -------------------------------------
less than or equal 1.250M (± 6.4%) i/s - 6.230M in 5.006896s
ancestors.include? 192.603k (± 4.8%) i/s - 965.751k in 5.025917s
Comparison:
less than or equal: 1249606.0 i/s
ancestors.include?: 192602.9 i/s - 6.49x slower
call vs send vs method_missing code $ ruby -v code/method/call-vs-send-vs-method_missing.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
call 115.094k i/100ms
send 105.258k i/100ms
method_missing 100.762k i/100ms
-------------------------------------------------
call 3.811M (± 5.9%) i/s - 18.991M
send 3.244M (± 7.2%) i/s - 16.210M
method_missing 2.729M (± 9.8%) i/s - 13.401M
Comparison:
call: 3811183.4 i/s
send: 3244239.1 i/s - 1.17x slower
method_missing: 2728893.0 i/s - 1.40x slower
&method(...) Kode $ ruby -v code/general/block-apply-method.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
normal 85.749k i/100ms
&method 35.529k i/100ms
-------------------------------------------------
normal 1.867M (± 7.6%) i/s - 9.347M
&method 467.095k (± 6.4%) i/s - 2.345M
Comparison:
normal: 1866669.5 i/s
&method: 467095.4 i/s - 4.00x slower
$ ruby -v code/general/array-argument-vs-splat-arguments.rb
ruby 2.1.7p400 (2015-08-18 revision 51632) [x86_64-linux-gnu]
Calculating -------------------------------------
Function with single Array argument
157.231k i/100ms
Function with splat arguments
4.983k i/100ms
-------------------------------------------------
Function with single Array argument
5.581M (± 2.0%) i/s - 27.987M
Function with splat arguments
54.428k (± 3.3%) i/s - 274.065k
Comparison:
Function with single Array argument: 5580972.6 i/s
Function with splat arguments: 54427.7 i/s - 102.54x slower
$ ruby -v code/general/hash-vs-openstruct-on-access.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
Calculating -------------------------------------
Hash 128.344k i/100ms
OpenStruct 110.723k i/100ms
-------------------------------------------------
Hash 5.279M (± 7.0%) i/s - 26.311M
OpenStruct 3.048M (± 7.0%) i/s - 15.169M
Comparison:
Hash: 5278844.0 i/s
OpenStruct: 3048139.8 i/s - 1.73x slower
$ ruby -v code/general/hash-vs-openstruct.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
Calculating -------------------------------------
Hash 75.510k i/100ms
OpenStruct 9.126k i/100ms
-------------------------------------------------
Hash 1.604M (±11.0%) i/s - 7.929M
OpenStruct 96.855k (± 9.9%) i/s - 483.678k
Comparison:
Hash: 1604259.1 i/s
OpenStruct: 96855.3 i/s - 16.56x slower
$ ruby -v code/general/format-vs-round-and-to-s.rb
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin15]
Warming up --------------------------------------
Float#round 106.645k i/100ms
Kernel#format 84.304k i/100ms
String#% 78.635k i/100ms
Calculating -------------------------------------
Float#round 1.570M (± 3.2%) i/s - 7.892M in 5.030672s
Kernel#format 1.144M (± 3.0%) i/s - 5.733M in 5.015621s
String#% 1.047M (± 4.2%) i/s - 5.269M in 5.042970s
Comparison:
Float#round: 1570411.4 i/s
Kernel#format: 1144036.6 i/s - 1.37x slower
String#%: 1046689.1 i/s - 1.50x slower
Array#bsearch vs Array#find Kode Peringatan: bsearch hanya bekerja pada array yang diurutkan . Detail lebih lanjut silakan lihat #29.
$ ruby -v code/array/bsearch-vs-find.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
find 1.000 i/100ms
bsearch 42.216k i/100ms
-------------------------------------------------
find 0.184 (± 0.0%) i/s - 1.000 in 5.434758s
bsearch 577.301k (± 6.6%) i/s - 2.913M
Comparison:
bsearch: 577300.7 i/s
find: 0.2 i/s - 3137489.63x slower
Array#length vs Array#size vs Array#count Kode Gunakan #length ketika Anda hanya ingin tahu berapa banyak elemen dalam array, #count juga bisa mencapai ini. Namun #count harus digunakan untuk menghitung elemen spesifik dalam array. Catatan #size adalah alias #length .
$ ruby -v code/array/length-vs-size-vs-count.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
Array#length 172.998k i/100ms
Array#size 168.130k i/100ms
Array#count 164.911k i/100ms
-------------------------------------------------
Array#length 11.394M (± 6.1%) i/s - 56.743M
Array#size 11.303M (± 6.5%) i/s - 56.324M
Array#count 9.195M (± 8.6%) i/s - 45.680M
Comparison:
Array#length: 11394036.7 i/s
Array#size: 11302701.1 i/s - 1.01x slower
Array#count: 9194976.2 i/s - 1.24x slower
Array#shuffle.first vs Array#sample Kode
Array#shufflemengalokasikan array tambahan.
Array#sampleke dalam array tanpa mengalokasikan array tambahan.
Inilah alasan mengapa array#sampel ada.
—— @sferik Rails/Rails#17245
$ ruby -v code/array/shuffle-first-vs-sample.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Array#shuffle.first 25.406k i/100ms
Array#sample 125.101k i/100ms
-------------------------------------------------
Array#shuffle.first 304.341k (± 4.3%) i/s - 1.524M
Array#sample 5.727M (± 8.6%) i/s - 28.523M
Comparison:
Array#sample: 5727032.0 i/s
Array#shuffle.first: 304341.1 i/s - 18.82x slower
Array#[](0) vs Array#first $ ruby -v code/array/array-first-vs-index.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Array#[0] 152.751k i/100ms
Array#first 148.088k i/100ms
-------------------------------------------------
Array#[0] 8.614M (± 7.0%) i/s - 42.923M
Array#first 7.465M (±10.7%) i/s - 36.874M
Comparison:
Array#[0]: 8613583.7 i/s
Array#first: 7464526.6 i/s - 1.15x slower
Array#[](-1) VS Array#last $ ruby -v code/array/array-last-vs-index.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Array#[-1] 151.940k i/100ms
Array#last 153.371k i/100ms
-------------------------------------------------
Array#[-1] 8.582M (± 4.6%) i/s - 42.847M
Array#last 7.639M (± 5.7%) i/s - 38.189M
Comparison:
Array#[-1]: 8582074.3 i/s
Array#last: 7639254.5 i/s - 1.12x slower
Array#insert vs Array#unshift Code $ ruby -v code/array/insert-vs-unshift.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin10.0]
Calculating -------------------------------------
Array#unshift 4.000 i/100ms
Array#insert 1.000 i/100ms
-------------------------------------------------
Array#unshift 44.947 (± 6.7%) i/s - 224.000
Array#insert 0.171 (± 0.0%) i/s - 1.000 in 5.841595s
Comparison:
Array#unshift: 44.9 i/s
Array#insert: 0.2 i/s - 262.56x slower
Array#concat vs Array#+ Code Array#+ Mengembalikan array baru yang dibangun dengan menggabungkan dua array bersama -sama untuk menghasilkan array ketiga. Array#concat menambahkan unsur -unsur array lain ke diri sendiri. Ini berarti bahwa operator + akan membuat array baru setiap kali disebut (yang mahal), sementara Concat hanya menambahkan elemen baru.
$ ruby -v code/array/array-concat-vs-+.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin18]
Warming up --------------------------------------
Array#concat 23.000 i/100ms
Array#+ 1.000 i/100ms
Calculating -------------------------------------
Array#concat 217.669 (±15.2%) i/s - 1.058k in 5.016952s
Array#+ 1.475 (± 0.0%) i/s - 8.000 in 5.467642s
Comparison:
Array#concat: 217.7 i/s
Array#+: 1.5 i/s - 147.54x slower
Array#new Vs Fixnum#times + map Code PetaPerlambatan khas adalah 40-60% tergantung pada ukuran array. Lihat permintaan tarik yang sesuai untuk karakteristik kinerja.
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
Calculating -------------------------------------
Array#new 63.875k i/100ms
Fixnum#times + map 48.010k i/100ms
-------------------------------------------------
Array#new 1.070M (± 2.2%) i/s - 5.365M
Fixnum#times + map 678.097k (± 2.7%) i/s - 3.409M
Comparison:
Array#new: 1069837.0 i/s
Fixnum#times + map: 678097.4 i/s - 1.58x slower
Array#sort.reverse vs Array#sort_by + kode blok $ ruby -v code/array/sort-reverse-vs-sort_by.rb
ruby 2.5.2p104 (2018-10-18 revision 65133) [x86_64-darwin13]
Warming up --------------------------------------
Array#sort.reverse
16.231k i/100ms
Array#sort_by &:-@
5.406k i/100ms
Calculating -------------------------------------
Array#sort.reverse
149.492k (±11.0%) i/s - 746.626k in 5.070375s
Array#sort_by &:-@
51.981k (± 8.8%) i/s - 259.488k in 5.041625s
Comparison:
Array#sort.reverse: 149492.2 i/s
Array#sort_by &:-@: 51980.6 i/s - 2.88x (± 0.00) slower
Enumerable#each + push vs kode Enumerable#map $ ruby -v code/enumerable/each-push-vs-map.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Array#each + push 9.025k i/100ms
Array#map 13.947k i/100ms
-------------------------------------------------
Array#each + push 99.634k (± 3.2%) i/s - 505.400k
Array#map 158.091k (± 4.2%) i/s - 794.979k
Comparison:
Array#map: 158090.9 i/s
Array#each + push: 99634.2 i/s - 1.59x slower
Enumerable#each VS for kode loop $ ruby -v code/enumerable/each-vs-for-loop.rb
ruby 2.2.0preview1 (2014-09-17 trunk 47616) [x86_64-darwin14]
Calculating -------------------------------------
For loop 17.111k i/100ms
#each 18.464k i/100ms
-------------------------------------------------
For loop 198.517k (± 5.3%) i/s - 992.438k
#each 208.157k (± 5.0%) i/s - 1.052M
Comparison:
#each: 208157.4 i/s
For loop: 198517.3 i/s - 1.05x slower
Enumerable#each_with_index vs while kode loopRails/Rails#12065
$ ruby -v code/enumerable/each_with_index-vs-while-loop.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
While Loop 22.553k i/100ms
each_with_index 11.963k i/100ms
-------------------------------------------------
While Loop 240.752k (± 7.1%) i/s - 1.218M
each_with_index 126.753k (± 5.9%) i/s - 634.039k
Comparison:
While Loop: 240752.1 i/s
each_with_index: 126753.4 i/s - 1.90x slower
Enumerable#map ... Array#flatten vs Enumerable#flat_map code- @sferik rails/rails @3413b88, ganti peta.flatten dengan flat_map, ganti peta.flatten (1) dengan flat_map
$ ruby -v code/enumerable/map-flatten-vs-flat_map.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Array#map.flatten(1) 3.315k i/100ms
Array#map.flatten 3.283k i/100ms
Array#flat_map 5.350k i/100ms
-------------------------------------------------
Array#map.flatten(1) 33.801k (± 4.3%) i/s - 169.065k
Array#map.flatten 34.530k (± 6.0%) i/s - 173.999k
Array#flat_map 55.980k (± 5.0%) i/s - 283.550k
Comparison:
Array#flat_map: 55979.6 i/s
Array#map.flatten: 34529.6 i/s - 1.62x slower
Array#map.flatten(1): 33800.6 i/s - 1.66x slower
Enumerable#reverse.each vs Enumerable#reverse_each code
Enumerable#reversemengalokasikan array tambahan.
Enumerable#reverse_eachmenghasilkan setiap nilai tanpa mengalokasikan array tambahan.
Inilah alasan mengapaEnumerable#reverse_eachada.
- @sferik Rails/Rails#17244
$ ruby -v code/enumerable/reverse-each-vs-reverse_each.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Array#reverse.each 16.746k i/100ms
Array#reverse_each 18.590k i/100ms
-------------------------------------------------
Array#reverse.each 190.729k (± 4.8%) i/s - 954.522k
Array#reverse_each 216.060k (± 4.3%) i/s - 1.078M
Comparison:
Array#reverse_each: 216060.5 i/s
Array#reverse.each: 190729.1 i/s - 1.13x slower
Enumerable#sort_by.first vs Enumerable#min_by code Enumerable#sort_by melakukan semacam yang terhindar dan mengalokasikan array baru ukuran yang dapat ditakuti. Enumerable#min_by tidak melakukan semacam atau mengalokasikan array seukuran yang dapat ditakuti. Perbandingan serupa berlaku untuk Enumerable#sort_by.last vs Enumerable#max_by , Enumerable#sort.first vs Enumerable#min , dan Enumerable#sort.last vs Enumerable#max .
$ ruby -v code/enumerable/sort_by-first-vs-min_by.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
Warming up --------------------------------------
Enumerable#min_by 15.170k i/100ms
Enumerable#sort_by...first
10.413k i/100ms
Calculating -------------------------------------
Enumerable#min_by 157.877k (± 0.9%) i/s - 804.010k in 5.093048s
Enumerable#sort_by...first
106.831k (± 1.3%) i/s - 541.476k in 5.069403s
Comparison:
Enumerable#min_by: 157877.0 i/s
Enumerable#sort_by...first: 106831.1 i/s - 1.48x slower
Enumerable#detect vs Enumerable#select.first Code $ ruby -v code/enumerable/select-first-vs-detect.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Enumerable#select.first 8.515k i/100ms
Enumerable#detect 33.885k i/100ms
-------------------------------------------------
Enumerable#select.first 89.757k (± 5.0%) i/s - 1.797M
Enumerable#detect 434.304k (± 5.2%) i/s - 8.675M
Comparison:
Enumerable#detect: 434304.2 i/s
Enumerable#select.first: 89757.4 i/s - 4.84x slower
Enumerable#select.last vs Enumerable#reverse.detect code $ ruby -v code/enumerable/select-last-vs-reverse-detect.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Enumerable#reverse.detect 62.636k i/100ms
Enumerable#select.last 11.687k i/100ms
-------------------------------------------------
Enumerable#reverse.detect 1.263M (± 8.2%) i/s - 6.326M
Enumerable#select.last 119.387k (± 5.7%) i/s - 596.037k
Comparison:
Enumerable#reverse.detect: 1263100.2 i/s
Enumerable#select.last: 119386.8 i/s - 10.58x slower
Enumerable#sort vs Enumerable#sort_by code $ ruby -v code/enumerable/sort-vs-sort_by.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
Enumerable#sort_by (Symbol#to_proc) 2.680k i/100ms
Enumerable#sort_by 2.462k i/100ms
Enumerable#sort 1.320k i/100ms
-------------------------------------------------
Enumerable#sort_by (Symbol#to_proc) 25.916k (± 4.4%) i/s - 131.320k
Enumerable#sort_by 24.650k (± 5.1%) i/s - 125.562k
Enumerable#sort 14.018k (± 5.6%) i/s - 69.960k
Comparison:
Enumerable#sort_by (Symbol#to_proc): 25916.1 i/s
Enumerable#sort_by: 24650.2 i/s - 1.05x slower
Enumerable#sort: 14018.3 i/s - 1.85x slower
Enumerable#inject Symbol vs Enumerable#inject Proc code Dari catatan, to_proc untuk 1.8.7 lebih lambat dari format blok
$ ruby -v code/enumerable/inject-symbol-vs-block.rb
ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-darwin14]
Warming up --------------------------------------
inject symbol 1.893k i/100ms
inject to_proc 1.583k i/100ms
inject block 1.390k i/100ms
Calculating -------------------------------------
inject symbol 19.001k (± 3.8%) i/s - 96.543k
inject to_proc 15.958k (± 3.5%) i/s - 80.733k
inject block 14.063k (± 3.9%) i/s - 70.890k
Comparison:
inject symbol: 19001.5 i/s
inject to_proc: 15958.3 i/s - 1.19x slower
inject block: 14063.1 i/s - 1.35x slower
Date.iso8601 vs Date.parse kode Saat mengharapkan data yang diformat dengan baik dari EG A API, iso8601 lebih cepat dan akan meningkatkan ArgumentError pada input yang salah.
$ ruby -v code/date/iso8601-vs-parse.rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
Warming up --------------------------------------
Date.iso8601 28.880k i/100ms
Date.parse 15.805k i/100ms
Calculating -------------------------------------
Date.iso8601 328.035k (± 4.7%) i/s - 1.646M in 5.029287s
Date.parse 175.546k (± 3.8%) i/s - 885.080k in 5.049444s
Comparison:
Date.iso8601: 328035.3 i/s
Date.parse: 175545.9 i/s - 1.87x slower
Hash#[] vs Hash#fetch code Jika Anda menggunakan Ruby 2.2, Symbol bisa lebih berkinerja lebih dari String sebagai kunci Hash . Baca lebih lanjut tentang ini: Simbol GC di Ruby 2.2 dan Mengurai Kinerja Kunci String di Ruby 2.2.
$ ruby -v code/hash/bracket-vs-fetch.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
Hash#[], symbol 143.850k i/100ms
Hash#fetch, symbol 137.425k i/100ms
Hash#[], string 143.083k i/100ms
Hash#fetch, string 120.417k i/100ms
-------------------------------------------------
Hash#[], symbol 7.531M (± 6.6%) i/s - 37.545M
Hash#fetch, symbol 6.644M (± 8.2%) i/s - 32.982M
Hash#[], string 6.657M (± 7.7%) i/s - 33.195M
Hash#fetch, string 3.981M (± 8.7%) i/s - 19.748M
Comparison:
Hash#[], symbol: 7531355.8 i/s
Hash#[], string: 6656818.8 i/s - 1.13x slower
Hash#fetch, symbol: 6643665.5 i/s - 1.13x slower
Hash#fetch, string: 3981166.5 i/s - 1.89x slower
Hash#dig vs Hash#[] vs Hash#fetch code Ruby 2.3 diperkenalkan Hash#dig yang merupakan opsi yang dapat dibaca dan berkinerja untuk pengambilan dari hash bersarang, mengembalikan nil jika langkah ekstraksi gagal. Lihat #102 (komentar) untuk info lebih lanjut.
$ ruby -v code/hash/dig-vs-[]-vs-fetch.rb
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
Calculating -------------------------------------
Hash#dig 5.719M (± 6.1%) i/s - 28.573M in 5.013997s
Hash#[] 6.066M (± 6.9%) i/s - 30.324M in 5.025614s
Hash#[] || 5.366M (± 6.5%) i/s - 26.933M in 5.041403s
Hash#[] && 2.782M (± 4.8%) i/s - 13.905M in 5.010328s
Hash#fetch 4.101M (± 6.1%) i/s - 20.531M in 5.024945s
Hash#fetch fallback 2.975M (± 5.5%) i/s - 14.972M in 5.048880s
Comparison:
Hash#[]: 6065791.0 i/s
Hash#dig: 5719290.9 i/s - same-ish: difference falls within error
Hash#[] ||: 5366226.5 i/s - same-ish: difference falls within error
Hash#fetch: 4101102.1 i/s - 1.48x slower
Hash#fetch fallback: 2974906.9 i/s - 2.04x slower
Hash#[] &&: 2781646.6 i/s - 2.18x slower
Hash[] vs Hash#dup kodeSumber: http://tenderlovemaking.com/2015/02/11/weird-stuff-with-hashes.html
Apakah ini berarti Anda harus beralih ke hash []? Hanya jika tolok ukur Anda dapat membuktikan bahwa itu adalah hambatan. Tolong tolong jangan ubah semua kode Anda karena ini menunjukkan lebih cepat. Pastikan untuk mengukur kinerja aplikasi Anda terlebih dahulu.
$ ruby -v code/hash/bracket-vs-dup.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Hash[] 29.403k i/100ms
Hash#dup 16.195k i/100ms
-------------------------------------------------
Hash[] 343.987k (± 8.7%) i/s - 1.735M
Hash#dup 163.516k (±10.2%) i/s - 825.945k
Comparison:
Hash[]: 343986.5 i/s
Hash#dup: 163516.3 i/s - 2.10x slower
Hash#fetch dengan argumen vs Hash#fetch + block codePerhatikan bahwa speedup dalam versi blok berasal dari menghindari berulang
konstruksi argumen. Jika argumennya konstan, simbol angka atau
sesuatu dari semacam itu versi argumen sebenarnya sedikit lebih cepat
Lihat juga #39 (komentar)
$ ruby -v code/hash/fetch-vs-fetch-with-block.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin13]
Calculating -------------------------------------
Hash#fetch + const 129.868k i/100ms
Hash#fetch + block 125.254k i/100ms
Hash#fetch + arg 121.155k i/100ms
-------------------------------------------------
Hash#fetch + const 7.031M (± 7.0%) i/s - 34.934M
Hash#fetch + block 6.815M (± 4.2%) i/s - 34.069M
Hash#fetch + arg 4.753M (± 5.6%) i/s - 23.746M
Comparison:
Hash#fetch + const: 7030600.4 i/s
Hash#fetch + block: 6814826.7 i/s - 1.03x slower
Hash#fetch + arg: 4752567.2 i/s - 1.48x slower
Hash#each_key bukan Hash#keys.each code
Hash#keys.eachmengalokasikan serangkaian tombol;
Hash#each_keyberulang melalui tombol tanpa mengalokasikan array baru.
Inilah alasan mengapaHash#each_keyada.
—— @sferik Rails/Rails#17099
$ ruby -v code/hash/keys-each-vs-each_key.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Hash#keys.each 56.690k i/100ms
Hash#each_key 59.658k i/100ms
-------------------------------------------------
Hash#keys.each 869.262k (± 5.0%) i/s - 4.365M
Hash#each_key 1.049M (± 6.0%) i/s - 5.250M
Comparison:
Hash#each_key: 1049161.6 i/s
Hash#keys.each: 869262.3 i/s - 1.21x slower
Hash#key? Alih -alih Hash#keys.include? kode
Hash#keys.include?mengalokasikan serangkaian kunci dan melakukan pencarian O (n);
Hash#key?Melakukan pencarian hash O (1) tanpa mengalokasikan array baru.
$ ruby -v code/hash/keys-include-vs-key.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
Calculating -------------------------------------
Hash#keys.include? 8.612k (± 2.5%) i/s - 43.248k in 5.024749s
Hash#key? 6.366M (± 5.5%) i/s - 31.715M in 5.002276s
Comparison:
Hash#key?: 6365855.5 i/s
Hash#keys.include?: 8612.4 i/s - 739.15x slower
Hash#value? Alih -alih Hash#values.include? kode
Hash#values.include?mengalokasikan serangkaian nilai dan melakukan pencarian O (n);
Hash#value?melakukan pencarian O (n) tanpa mengalokasikan array baru.
$ ruby -v code/hash/values-include-vs-value.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
Calculating -------------------------------------
Hash#values.include? 23.187k (± 4.3%) i/s - 117.720k in 5.086976s
Hash#value? 38.395k (± 1.0%) i/s - 194.361k in 5.062696s
Comparison:
Hash#value?: 38395.0 i/s
Hash#values.include?: 23186.8 i/s - 1.66x slower
Hash#merge! vs Hash#[]= kode $ ruby -v code/hash/merge-bang-vs-[]=.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Hash#merge! 1.023k i/100ms
Hash#[]= 2.844k i/100ms
-------------------------------------------------
Hash#merge! 10.653k (± 4.9%) i/s - 53.196k
Hash#[]= 28.287k (±12.4%) i/s - 142.200k
Comparison:
Hash#[]=: 28287.1 i/s
Hash#merge!: 10653.3 i/s - 2.66x slower
Hash#update vs Hash#[]= kode $ ruby -v code/hash/update-vs-[]=.rb
ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-darwin18]
Warming up --------------------------------------
Hash#[]= 7.453k i/100ms
Hash#update 4.311k i/100ms
Calculating -------------------------------------
Hash#[]= 74.764k (± 1.9%) i/s - 380.103k in 5.085962s
Hash#update 43.220k (± 0.8%) i/s - 219.861k in 5.087364s
Comparison:
Hash#[]=: 74764.0 i/s
Hash#update: 43220.1 i/s - 1.73x (± 0.00) slower
Hash#merge vs Hash#**other $ ruby -v code/hash/merge-vs-double-splat-operator.rb
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin15]
Warming up --------------------------------------
Hash#**other 64.624k i/100ms
Hash#merge 38.827k i/100ms
Calculating -------------------------------------
Hash#**other 798.397k (± 6.9%) i/s - 4.007M in 5.053516s
Hash#merge 434.171k (± 4.5%) i/s - 2.174M in 5.018927s
Comparison:
Hash#**other: 798396.6 i/s
Hash#merge: 434170.8 i/s - 1.84x slower
Hash#merge vs Hash#merge! kode $ ruby -v code/hash/merge-vs-merge-bang.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Hash#merge 39.000 i/100ms
Hash#merge! 1.008k i/100ms
-------------------------------------------------
Hash#merge 409.610 (± 7.6%) i/s - 2.067k
Hash#merge! 9.830k (± 5.8%) i/s - 49.392k
Comparison:
Hash#merge!: 9830.3 i/s
Hash#merge: 409.6 i/s - 24.00x slower
{}#merge!(Hash) vs Hash#merge({}) vs Hash#dup#merge!({}) kodeKetika kami tidak ingin memodifikasi hash asli, dan kami ingin duplikat dibuat
Lihat #42 untuk detail lebih lanjut.
$ ruby -v code/hash/merge-bang-vs-merge-vs-dup-merge-bang.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
Calculating -------------------------------------
{}#merge!(Hash) do end 2.006k i/100ms
Hash#merge({}) 762.000 i/100ms
Hash#dup#merge!({}) 736.000 i/100ms
-------------------------------------------------
{}#merge!(Hash) do end 20.055k (± 2.0%) i/s - 100.300k in 5.003322s
Hash#merge({}) 7.676k (± 1.2%) i/s - 38.862k in 5.063382s
Hash#dup#merge!({}) 7.440k (± 1.1%) i/s - 37.536k in 5.045851s
Comparison:
{}#merge!(Hash) do end: 20054.8 i/s
Hash#merge({}): 7676.3 i/s - 2.61x slower
Hash#dup#merge!({}): 7439.9 i/s - 2.70x slower
Hash#sort_by vs Hash#sort CodeUntuk mengurutkan hash berdasarkan kunci.
$ ruby -v code/hash/hash-key-sort_by-vs-sort.rb
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14]
Calculating -------------------------------------
sort_by + to_h 11.468k i/100ms
sort + to_h 8.107k i/100ms
-------------------------------------------------
sort_by + to_h 122.176k (± 6.0%) i/s - 619.272k
sort + to_h 81.973k (± 4.7%) i/s - 413.457k
Comparison:
sort_by + to_h: 122176.2 i/s
sort + to_h: 81972.8 i/s - 1.49x slower
Hash#slice vs Implementasi Slice lainnya sebelum kode asli Karena Ruby 2.5, Hash dilengkapi dengan metode slice untuk memilih anggota hash dengan kunci.
$ ruby -v code/hash/slice-native-vs-before-native.rb
ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-linux]
Warming up --------------------------------------
Hash#native-slice 178.077k i/100ms
Array#each 124.311k i/100ms
Array#each_w/_object 110.818k i/100ms
Hash#select-include 66.972k i/100ms
Calculating -------------------------------------
Hash#native-slice 2.540M (± 1.5%) i/s - 12.822M in 5.049955s
Array#each 1.614M (± 1.0%) i/s - 8.080M in 5.007925s
Array#each_w/_object 1.353M (± 2.6%) i/s - 6.760M in 5.000441s
Hash#select-include 760.944k (± 0.9%) i/s - 3.817M in 5.017123s
Comparison:
Hash#native-slice : 2539515.5 i/s
Array#each : 1613665.5 i/s - 1.57x slower
Array#each_w/_object: 1352851.8 i/s - 1.88x slower
Hash#select-include : 760944.2 i/s - 3.34x slower
Symbol#to_proc kode
Symbol#to_procjauh lebih ringkas daripada menggunakan sintaks blok.
... Dalam beberapa kasus, ini mengurangi jumlah baris kode.
—— @sferik Rails/Rails#16833
$ ruby -v code/proc-and-block/block-vs-to_proc.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
Block 4.632k i/100ms
Symbol#to_proc 5.225k i/100ms
-------------------------------------------------
Block 47.914k (± 6.3%) i/s - 240.864k
Symbol#to_proc 54.791k (± 4.1%) i/s - 276.925k
Comparison:
Symbol#to_proc: 54791.1 i/s
Block: 47914.3 i/s - 1.14x slower
Proc#call dan Blok Argumen vs yieldDalam MRI Ruby sebelum 2.5, argumen blok dikonversi menjadi procs, yang menimbulkan alokasi tumpukan.
$ ruby -v code/proc-and-block/proc-call-vs-yield.rb
ruby 2.4.4p296 (2018-03-28 revision 63013) [x86_64-darwin18]
Calculating -------------------------------------
block.call 1.967M (± 2.0%) i/s - 9.871M in 5.019328s
block + yield 2.147M (± 3.3%) i/s - 10.814M in 5.044319s
unused block 2.265M (± 1.9%) i/s - 11.333M in 5.004522s
yield 10.436M (± 1.6%) i/s - 52.260M in 5.008851s
Comparison:
yield: 10436414.0 i/s
unused block: 2265399.0 i/s - 4.61x slower
block + yield: 2146619.0 i/s - 4.86x slower
block.call: 1967300.9 i/s - 5.30x slower
MRI Ruby 2.5 mengimplementasikan alokasi Proc Lazy untuk parameter blok, yang mempercepat sekitar 3x.:
$ ruby -v code/proc-and-block/proc-call-vs-yield.rb
ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-darwin18]
Calculating -------------------------------------
block.call 1.970M (± 2.3%) i/s - 9.863M in 5.009599s
block + yield 9.075M (± 2.6%) i/s - 45.510M in 5.018369s
unused block 11.176M (± 2.7%) i/s - 55.977M in 5.012741s
yield 10.588M (± 1.9%) i/s - 53.108M in 5.017755s
Comparison:
unused block: 11176355.0 i/s
yield: 10588342.3 i/s - 1.06x slower
block + yield: 9075355.5 i/s - 1.23x slower
block.call: 1969834.0 i/s - 5.67x slower
MRI Ruby 2.6 mengimplementasikan optimasi untuk blok.call di mana parameter blok dilewatkan:
$ ruby -v code/proc-and-block/proc-call-vs-yield.rb
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
Calculating -------------------------------------
block.call 10.587M (± 1.2%) i/s - 52.969M in 5.003808s
block + yield 12.630M (± 0.3%) i/s - 63.415M in 5.020910s
unused block 15.981M (± 0.8%) i/s - 80.255M in 5.022305s
yield 15.352M (± 3.1%) i/s - 76.816M in 5.009404s
Comparison:
unused block: 15980789.4 i/s
yield: 15351931.0 i/s - 1.04x slower
block + yield: 12630378.1 i/s - 1.27x slower
block.call: 10587315.1 i/s - 1.51x slower
String#dup vs String#+ kode Perhatikan bahwa String.new tidak sama dengan opsi yang dibandingkan, karena selalu disandikan ASCII-8BIT alih-alih pengkodean skrip (biasanya UTF-8 ).
$ ruby -v code/string/dup-vs-unary-plus.rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
Calculating -------------------------------------
String#+@ 7.697M (± 1.4%) i/s - 38.634M in 5.020313s
String#dup 3.566M (± 1.0%) i/s - 17.860M in 5.008377s
Comparison:
String#+@: 7697108.3 i/s
String#dup: 3566485.7 i/s - 2.16x slower
String#casecmp vs String#casecmp? vs String#downcase + == kode String#casecmp? tersedia di Ruby 2.4 atau yang lebih baru. Perhatikan bahwa String#casecmp hanya berfungsi pada karakter AZ/AZ, tidak semua Unicode.
$ ruby -v code/string/casecmp-vs-downcase-==.rb
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]
Warming up --------------------------------------
String#casecmp? 395.796k i/100ms
String#downcase + == 543.958k i/100ms
String#casecmp 730.028k i/100ms
Calculating -------------------------------------
String#casecmp? 3.687M (±10.9%) i/s - 18.602M in 5.158065s
String#downcase + == 5.017M (±11.3%) i/s - 25.022M in 5.089175s
String#casecmp 6.948M (± 6.0%) i/s - 35.041M in 5.062714s
Comparison:
String#casecmp: 6948231.0 i/s
String#downcase + ==: 5017089.5 i/s - 1.38x (± 0.00) slower
String#casecmp?: 3686650.7 i/s - 1.88x (± 0.00) slower
$ ruby -v code/string/concatenation.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
Warming up --------------------------------------
String#+ 149.298k i/100ms
String#concat 151.505k i/100ms
String#append 153.389k i/100ms
"foo" "bar" 195.552k i/100ms
"#{'foo'}#{'bar'}" 193.784k i/100ms
Calculating -------------------------------------
String#+ 2.977M (± 1.1%) i/s - 14.930M in 5.015179s
String#concat 3.017M (± 1.3%) i/s - 15.150M in 5.023063s
String#append 3.076M (± 1.2%) i/s - 15.492M in 5.037683s
"foo" "bar" 5.370M (± 1.0%) i/s - 26.986M in 5.026271s
"#{'foo'}#{'bar'}" 5.182M (± 4.6%) i/s - 25.967M in 5.022093s
Comparison:
"foo" "bar": 5369594.5 i/s
"#{'foo'}#{'bar'}": 5181745.7 i/s - same-ish: difference falls within error
String#append: 3075719.2 i/s - 1.75x slower
String#concat: 3016703.5 i/s - 1.78x slower
String#+: 2977282.7 i/s - 1.80x slower
String#match vs String.match? vs String#start_with? / String#end_with? Kode (Mulai) Kode (Akhir) Pendekatan ekspresi reguler menjadi lebih lambat karena string yang diuji menjadi lebih lama. Untuk string pendek, String#match? melakukan serupa dengan String#start_with? / String#end_with? .
️
Terkadang Anda tidak bisa mengganti regexp denganstart_with?,
Misalnya:"anb" =~ /^b/ #=> 2tetapi"anb" =~ /Ab/ #=> nil.️
$ ruby -v code/string/start-string-checking-match-vs-start_with.rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
Calculating -------------------------------------
String#=~ 1.088M (± 4.0%) i/s - 5.471M in 5.034404s
String#match? 5.138M (± 5.0%) i/s - 25.669M in 5.008810s
String#start_with? 6.314M (± 4.3%) i/s - 31.554M in 5.007207s
Comparison:
String#start_with?: 6314182.0 i/s
String#match?: 5138115.1 i/s - 1.23x slower
String#=~: 1088461.5 i/s - 5.80x slower
$ ruby -v code/string/end-string-checking-match-vs-end_with.rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
Calculating -------------------------------------
String#=~ 918.101k (± 6.0%) i/s - 4.650M in 5.084079s
String#match? 3.009M (± 6.8%) i/s - 14.991M in 5.005691s
String#end_with? 4.548M (± 9.3%) i/s - 22.684M in 5.034115s
Comparison:
String#end_with?: 4547871.0 i/s
String#match?: 3008554.5 i/s - 1.51x slower
String#=~: 918100.5 i/s - 4.95x slower
String#start_with? vs String#[].== kode $ ruby -v code/string/end-string-checking-match-vs-end_with.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
String#start_with? 2.047M (± 4.5%) i/s - 10.242M in 5.015146s
String#[0, n] == 711.802k (± 7.3%) i/s - 3.551M in 5.019543s
String#[RANGE] == 651.751k (± 6.2%) i/s - 3.296M in 5.078772s
String#[0...n] == 427.207k (± 5.7%) i/s - 2.136M in 5.019245s
Comparison:
String#start_with?: 2046618.9 i/s
String#[0, n] ==: 711802.3 i/s - 2.88x slower
String#[RANGE] ==: 651751.2 i/s - 3.14x slower
String#[0...n] ==: 427206.8 i/s - 4.79x slower
Regexp#=== VS Regexp#match vs Regexp#match? vs String#match vs String#=~ vs String#match? kode String#match? dan Regexp#match? tersedia di Ruby 2.4 atau yang lebih baru. ActiveSupport memberikan ekstensi Regexp yang kompatibel untuk rubi yang lebih tua tanpa peningkatan kecepatan.
️
Terkadang Anda tidak dapat menggantimatchdenganmatch?,
Ini hanya berguna untuk kasus di mana Anda memeriksa
untuk kecocokan dan tidak menggunakan objek kecocokan yang dihasilkan.️
Regexp#===juga lebih cepat dariString#matchtetapi Anda perlu mengganti urutan argumen.
$ ruby -v code/string/===-vs-=~-vs-match.rb
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
Calculating -------------------------------------
Regexp#match? 6.994M (± 3.0%) i/s - 35.144M in 5.029647s
String#match? 6.909M (± 3.3%) i/s - 34.663M in 5.023177s
String#=~ 2.784M (± 5.2%) i/s - 13.996M in 5.043168s
Regexp#=== 2.702M (± 4.5%) i/s - 13.631M in 5.056215s
Regexp#match 2.607M (± 4.9%) i/s - 13.025M in 5.009071s
String#match 2.362M (± 5.7%) i/s - 11.817M in 5.020344s
Comparison:
Regexp#match?: 6994107.7 i/s
String#match?: 6909055.7 i/s - same-ish: difference falls within error
String#=~: 2783577.8 i/s - 2.51x slower
Regexp#===: 2702030.0 i/s - 2.59x slower
Regexp#match: 2607484.0 i/s - 2.68x slower
String#match: 2362314.8 i/s - 2.96x slower
Lihat #59 dan #62 untuk diskusi.
String#gsub vs String#sub Vs String#[]= Kode $ ruby -v code/string/gsub-vs-sub.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
Warming up --------------------------------------
String#gsub 48.360k i/100ms
String#sub 45.739k i/100ms
String#dup["string"]= 59.896k i/100ms
Calculating -------------------------------------
String#gsub 647.666k (± 3.3%) i/s - 3.240M in 5.008504s
String#sub 756.665k (± 2.0%) i/s - 3.796M in 5.019235s
String#dup["string"]= 917.873k (± 1.8%) i/s - 4.612M in 5.026253s
Comparison:
String#dup["string"]=: 917873.1 i/s
String#sub: 756664.7 i/s - 1.21x slower
String#gsub: 647665.6 i/s - 1.42x slower
String#gsub vs String#tr CodeRails/Rails#17257
$ ruby -v code/string/gsub-vs-tr.rb
ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
Calculating -------------------------------------
String#gsub 38.268k i/100ms
String#tr 83.210k i/100ms
-------------------------------------------------
String#gsub 516.604k (± 4.4%) i/s - 2.602M
String#tr 1.862M (± 4.0%) i/s - 9.320M
Comparison:
String#tr: 1861860.4 i/s
String#gsub: 516604.2 i/s - 3.60x slower
String#gsub vs String#tr VS String#delete Code ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
Calculating -------------------------------------
String#gsub 1.342M (± 1.3%) i/s - 6.816M in 5.079675s
String#tr 2.627M (± 1.0%) i/s - 13.387M in 5.096083s
String#delete 2.924M (± 0.7%) i/s - 14.889M in 5.093070s
String#delete const 3.136M (± 2.6%) i/s - 15.866M in 5.064043s
Comparison:
String#delete const: 3135559.1 i/s
String#delete: 2923531.8 i/s - 1.07x slower
String#tr: 2627150.5 i/s - 1.19x slower
String#gsub: 1342013.4 i/s - 2.34x slower
Mutable vs Immutable $ ruby -v code/string/mutable_vs_immutable_strings.rb
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin14]
Calculating -------------------------------------
Without Freeze 7.279M (± 6.6%) i/s - 36.451M in 5.029785s
With Freeze 9.329M (± 7.9%) i/s - 46.370M in 5.001345s
Comparison:
With Freeze: 9329054.3 i/s
Without Freeze: 7279203.1 i/s - 1.28x slower
String#sub! vs String#gsub! vs String#[]= kode Perhatikan bahwa String#[] akan melempar IndexError saat diberikan string atau regexp tidak cocok.
$ ruby -v code/string/sub!-vs-gsub!-vs-[]=.rb
ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
Calculating -------------------------------------
String#['string']= 74.512k i/100ms
String#sub!'string' 52.801k i/100ms
String#gsub!'string' 34.480k i/100ms
String#[/regexp/]= 55.325k i/100ms
String#sub!/regexp/ 45.770k i/100ms
String#gsub!/regexp/ 27.665k i/100ms
-------------------------------------------------
String#['string']= 1.215M (± 6.2%) i/s - 6.110M
String#sub!'string' 752.731k (± 6.2%) i/s - 3.749M
String#gsub!'string' 481.183k (± 4.4%) i/s - 2.414M
String#[/regexp/]= 840.615k (± 5.3%) i/s - 4.205M
String#sub!/regexp/ 663.075k (± 7.8%) i/s - 3.295M
String#gsub!/regexp/ 342.004k (± 7.5%) i/s - 1.715M
Comparison:
String#['string']=: 1214845.5 i/s
String#[/regexp/]=: 840615.2 i/s - 1.45x slower
String#sub!'string': 752731.4 i/s - 1.61x slower
String#sub!/regexp/: 663075.3 i/s - 1.83x slower
String#gsub!'string': 481183.5 i/s - 2.52x slower
String#gsub!/regexp/: 342003.8 i/s - 3.55x slower
String#sub Vs String#delete_prefix Kode Ruby 2.5 yang diperkenalkan String#delete_prefix . Perhatikan bahwa ini hanya dapat digunakan untuk menghapus karakter dari awal string.
$ ruby -v code/string/sub-vs-delete_prefix.rb
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
Calculating -------------------------------------
String#delete_prefix 4.112M (± 1.8%) i/s - 20.707M in 5.037928s
String#sub 814.725k (± 1.4%) i/s - 4.088M in 5.018962s
Comparison:
String#delete_prefix: 4111531.1 i/s
String#sub: 814725.3 i/s - 5.05x slower
String#sub Vs String#chomp vs String#delete_suffix Kode Ruby 2.5 diperkenalkan String#delete_suffix sebagai mitra untuk delete_prefix . Keuntungan kinerja lebih dari chomp kecil dan selama beberapa berjalan, perbedaan berada dalam margin kesalahan. Perhatikan bahwa ini hanya dapat digunakan untuk menghapus karakter dari ujung string.
$ ruby -v code/string/sub-vs-chomp-vs-delete_suffix.rb
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
Calculating -------------------------------------
String#sub 838.415k (± 1.7%) i/s - 4.214M in 5.027412s
String#chomp 3.951M (± 2.1%) i/s - 19.813M in 5.017089s
String#delete_suffix 4.202M (± 2.1%) i/s - 21.075M in 5.017429s
Comparison:
String#delete_suffix: 4202201.7 i/s
String#chomp: 3950921.9 i/s - 1.06x slower
String#sub: 838415.3 i/s - 5.01x slower
String#unpack1 vs String#unpack[0] Kode Ruby 2.4.0 Diperkenalkan unpack1 untuk melewatkan membuat objek array menengah.
$ ruby -v code/string/unpack1-vs-unpack[0].rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
Warming up --------------------------------------
String#unpack1 224.291k i/100ms
String#unpack[0] 201.870k i/100ms
Calculating -------------------------------------
String#unpack1 4.864M (± 4.2%) i/s - 24.448M in 5.035203s
String#unpack[0] 3.778M (± 4.0%) i/s - 18.976M in 5.031253s
Comparison:
String#unpack1: 4864467.2 i/s
String#unpack[0]: 3777815.6 i/s - 1.29x slower
Kode diuji terhadap ruang yang berdekatan tetapi harus bekerja untuk karakter lain juga.
$ ruby -v code/string/remove-extra-spaces-or-other-chars.rb
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]
Warming up --------------------------------------
String#gsub/regex+/ 1.644k i/100ms
String#squeeze 24.681k i/100ms
Calculating -------------------------------------
String#gsub/regex+/ 14.668k (± 5.1%) i/s - 73.980k in 5.056887s
String#squeeze 372.910k (± 8.4%) i/s - 1.851M in 5.011881s
Comparison:
String#squeeze: 372910.3 i/s
String#gsub/regex+/: 14668.1 i/s - 25.42x slower
Time.iso8601 vs Time.parse kode Saat mengharapkan data yang diformat dengan baik dari EG A API, iso8601 lebih cepat dan akan meningkatkan ArgumentError pada input yang salah.
$ ruby -v code/time/iso8601-vs-parse.rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin17]
Warming up --------------------------------------
Time.iso8601 10.234k i/100ms
Time.parse 4.228k i/100ms
Calculating -------------------------------------
Time.iso8601 114.485k (± 3.5%) i/s - 573.104k in 5.012008s
Time.parse 43.711k (± 4.1%) i/s - 219.856k in 5.038349s
Comparison:
Time.iso8601: 114485.1 i/s
Time.parse: 43710.9 i/s - 2.62x slower
cover? vs include? kode cover? Hanya periksa apakah itu dalam awal dan akhir, include? perlu melintasi seluruh jajaran.
$ ruby -v code/range/cover-vs-include.rb
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
Calculating -------------------------------------
range#cover? 85.467k i/100ms
range#include? 7.720k i/100ms
range#member? 7.783k i/100ms
plain compare 102.189k i/100ms
-------------------------------------------------
range#cover? 1.816M (± 5.6%) i/s - 9.060M
range#include? 83.344k (± 5.0%) i/s - 416.880k
range#member? 82.654k (± 5.0%) i/s - 412.499k
plain compare 2.581M (± 6.2%) i/s - 12.876M
Comparison:
plain compare: 2581211.8 i/s
range#cover?: 1816038.5 i/s - 1.42x slower
range#include?: 83343.9 i/s - 30.97x slower
range#member?: 82654.1 i/s - 31.23x slower
Checkout: https://github.com/fastruby/fast-ruby/wiki/less-idiomatic-but-with-significan-performance-piference
Silakan! Edit readme.md ini lalu kirimkan permintaan tarik yang luar biasa!
Contoh kode salah? ? Punya contoh yang lebih baik? ? Bagus sekali!
Harap buka masalah atau buka permintaan tarik untuk memperbaikinya.
Terima kasih sebelumnya! ?
Bagikan ini dengan #Rubyfriends Anda! <3
Dibawa kepada Anda oleh @JuanItofatas
Jangan ragu untuk berbicara dengan saya di Twitter! <3
Tolok ukur yang tergelincir
Pergi lebih cepat, dari rel - tolok ukur untuk seluruh aplikasi Rails Anda
Benchmarking Ruby
Bicara oleh Davy Stevenson @ Rubyconf 2014.
Davy/Benchmark-Bigo
Memberikan pembandingan notasi O besar untuk Ruby.
Tantangan Ruby
Bicara oleh Prem Sichanugrist @ Ruby Kaigi 2014.
Lebih cepat
Buat rubi Anda lebih cepat dengan alat baris perintah ini.
Karya ini dilisensikan di bawah lisensi internasional Creative Commons Attribution-Sharealike 4.0.
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